Process of compressing peroxid of sodium.



UNITED STATES PATENT GEORGE FRANCOIS JAUBERT, OF PARIS, FRANCE.

PROCESS OF COMPRESSING P EROXlD OF SJODIUM.

SPECIFICATION forming part Of Letters Patent No. 709,490, dated September 23, 1902.

Application filed April 23, 1901. Serial lilo. 67,115. (No specimens.)

To all whom zit may concern:

Be'it known that I, GEORGE FRANQOIS J AU- BERT, a citizen of the Republic of Switzerland, residing at Paris, France, have invented a new and useful Improvement in Processes of lets.

The peroxid of sodium used in bleaching i only actually known in the form of a fine powder having a slightly-yellow appearance. When. it is placed in contact with fabric or other inflammable material,the powder heats,

as is well known, and even to such a degree as to fire the same. This powder of peroxid of sodium placed in water decomposes partially with brisk eifervescence. It is therezo fore usually recommended to place the peroxids into the water slowly in small quantities only, at the same time constantlystirring in order to avoid-a too-violent reaction,

' which may manifest itself'as an explosion, by 2 5 hissing, or boiling.

I have found that the peroxid of sodium which, as above stated, in the form of a fine powder or of very smallperfectly-friable particles' possesses, contrary to what would be expected from this last property, the property of agglomerating under strong pressure and without the aid of any agglutinant, giving to the compressed material very great hardness and very great density. Thus the density of ordinary peroxid of sodium in powder being about one, that of compressed peroxid of sodium will attain from 1.6 to 1.7. This compressed peroxid is very dense, very hard,and does not easily disintegrate. Placed 0 in water, a slight disengagement of oxygen takes place at first, which soon ceases almost entirely, for-it becomes covered at once with a layer of hydrate of peroxid of sodium,which dissolves slowly without giving rise to any 5 tumultuous disengagement. Thiscompressed peroxid of sodium, further, when placed in contact with inflammable substances is not dangerous in use, as is the powder of peroxid alone. By compression I avoid the two main 5o objections to'the peroxid .of sodium-that is to say, its almost explosive decomposition in presence of water and the danger of fire. I

have'also found that by agglomerating not only pure peroxid of sodium but a mixture in the proportions desired of peroxid of sodium and an acid salt-for example, bisulfate, polysulfate, and'the likeor of a suitable dry organic or mineral acid there is ob.- tained compressed material which placed in water and owing tothe formation of neutral by a powerful press giving seven thousand.

kilograms pressure upon the surface of the punch, whose area in this case is about twentyfive square centimeters. The cylinder being charged with five hundred grams of peroxid of sodium in powder, '1' cause the punch to descend, and after several blows of the press a cylinder of fifty-seven millimeters diameter and one hundred and twenty millimeters .high may be taken out of the mold, it being absolutely hard and being of a density of H from 1.6 to 1.7.

It is evident that with other molds or other pastil-machines may be made any size pastils desired by the consumer.

In order to compress the peroxid of sodium with the addition of bisulfate of potash, I proceed as" in the above example; but instead of pure peroxid of sodium in powder I employ a very intimate mixture of thirtynine parts of peroxid and of one hundred and thirty-six parts of bisulfate of potash melted and then pulverized. The mixture is compressed as above, and the past placed in water gives a neutral solution 'of oxygenized water. These pastils may be perfectly preserved in a stoppered bottle.

I may replace the bisulfate by equivalent quantities of anhydrous bisulfate of sodium, anhydrous oxalic acid, tartaric acid, and the like or by a mixture of these acid products.

Having thus described the nature and objeets of my invention, what I claim as new,; i In testimony whereofi I have signed this and desire to secure by Letters Patent, is specification in the presence of two subscrib- Themethod ofeompressiug sodium peroxid, iug witnesses. which consists in first pulverizing the sodium 7 peroxid,then meli-ingand pulverizinganother GEORGE FRANCOIS JAUBERT' salt, then mixing thepnlverized sodium per Witnesses: oxid and the pulverized salt and finally com- PAUL DE MESTRAL,

pressing the mixture into pastils or tablets. EDWARD P. MACLEAN. 

